Jacketed rotary blower casing



Oct. 23, 1934. w. VAN RIJSWIJK JACKETED ROTARY BLOWER CASING Filed March30, 1952 afentecl ct 23, 119334 PATENT oElcE JACKETED ROTARY BLOWERCASING Willem van Rijswijk, Baden, Switzerland, as-

signor to Aktiengesellschaft Brown Boveri & Cie., Baden, Switzerland, ajoint-stock company of Switzerland Application March so, 1932, serialNo. 601,913 In Germany March 30, 1931 v6 claims. `(o1. 23o-133)atedtwith the casing of the blower or compressor to form a coolingchamber integral with the blower or compressor structure. Suchconstructions,ihowever, have the disadvantage that the cooling mediumchamber was almost inaccessible i5 for'cleaning purposes and that it wasimpossible to inspect the outer surface of the casing forming one wallof such cooling chamber.l The provision of a large number of coveredapertures through the jacket for cleaning and inspection purposes 26 wasnot sufficient to provide for access to the cooling chamber withsufficient freedom to permit thorough cleaning and inspection thereof,and removal and replacement of such covers required a great deal oftime. Removal of the upper portions of the blower or compressor casingfor inspection or repair of the internal portions of such blower orcompressor required the removing of the bolts connecting the flanges ofthe casing as wellas the `bolts connecting the flanges ofthe jacket, andfrequently resulted in damage to or leakage from the cooling chamberformed by such jacket and casing, particularly when the jacket was notmade integral with the casing structure. Even though no damage wasdone'to the cooling chamber during such removal, a great length of timewas required for the operation because of the large number of boltswhich had to be removed and replaced. Such length of time isparticularly diicult to obtain in installations where the com'- pressermust remain substantially constantlyin service. K 1 y It is, therefore,among the objects of the present invention to'provide a rotary'blower orcomr pressor structure in which a removable jacketis associated witheach portion of the casing of the blower or compressor to form chambersthere# with for the circulation of a cooling medium therethrough. g i

Another object of the invention is to` provide a rotary blower orcompressor structure in which a removable jacket is so associated `with`each portion of the casing of such `blower or compressor to form achamberfor the circulation of va cooling medium therethrough as topermit removal ofi the jacket without disturbance of the operation ofthe machine.

Another object `of the invention is to provide a rotary blower orcompressor structure in which a removable jacket-isso associated witheach portion of the casing of such blower or compressor to form achamber for the circulation of a cooling medium then-throughA as topermit opening of the casing without disturbing the arrangement of thejacket associated with each portion thereof.

Another vobject of the invention is to provide a rotary `blower orcompressor structure in which a removable jacket of relatively thinsheet metal is arranged on each casing portion of the blower orcompressor to form a chamber for the circula- 7G tion of a coolingmediumtherethrough and is supported and spaced therefrom by ribs on thecasing.

Objects and advantages other than those above set forth will be apparentfrom the following description when read in connection with theaccompanying drawing in which:

Fig. l is a partial longitudinal sectional View, taken ona centralplane, through the upper portion of a rotary blower or compressorembodying the present invention; and

Fig. 2 is an endv elevation, shown partly in section, of a rotary bloweror compressor provided with chambers for the circulation of a coolingmedium` therethrough about each portion of the blower or compressorstructure.

Referring more particularly to the drawing by characters of reference,the reference numeral 6 designates the upper and the reference numeral 7designates the lower half of. a casing for a rotary blower orcompressor, the casing halves being capable of attachment to each otherby joining the fianges 8 and 9 thereof respectively by means of boltspassing through such flanges or by other suitable means now known. Thecasing is substantially cylindrical and has a deeply corrugated surface.The casing is provided with ribs 11 extending valong the casing, whichribs aid in` transmittingthe heat7 produced in the compressor, outwardlyto a cooling medium as will be described hereinafter.. The casing halves6 and 7 are each provided with a second flange l2 and 13 respectivelyextending outwardly about the entire casing `structure substantially atright angles to the outersuriace thereof. The flanges 12 and 13` arearranged a sufficient distance from 105 flanges 8 and 9. Each of theflanges 12 and l3has a groove 14 formed therein and is provided with aplurality of eyes, on each of the longitudij nal side of such flanges,as at 16 and 17.

A shaft21is mounted for rotation Within the 110 casing 6, 7 and hasmounted thereon a plurality of impeller wheels 22, here shown as beingof the central inlet peripheral discharge type, arranged to act on aiiuid in series. The wheels are separated from each other by walls 24,25, 26 and 27, forming, with the depressed sections of the compressorcasing portion from which the corrugated surface of the casing results,passage ways from the discharge of one wheel to the inlet of thefollowing wheel. The fluid to be operated upon by the blower is drawninto the first wheel through an inlet conduit 31 and passes through thewheels in succession to the last of such wheels from which it isdischarged through a discharge conduit 32.

Each of the halves of the blower casing is provided with a sheet metalcover 33 or 34 preferably made of relatively thin copper or other metalhaving a high heat conductivity, which covers form jackets cooperatingwith the casing portions to form chambers for the circulation of acooling medium therethrough about each of the casing portions. The edgesof the jackets are sealed into the grooves 14 in the flanges 12 and 13in any suitable manner but preferably by means of a material which willpermit removal and replacement of the jackets without damage to eitherthe casing or the jackets and which will prevent leakages of the coolingmedium through the joint between the casing portions and the jackets.When arranged on the halves of the casing, the jackets are retained intheir positions by means of rods 36 and 37 attached at the ends thereofto the eyes 16 and 17 and provided with turn buckles 38 and 39 or othersuitable devices to permit proper tensioning of the rods. When the rodsare tensioned, the jackets are drawn into contact with the edges of theribs 11 and into the grooves 14 thus securing a firm and continuoussupport for lthe jackets as well as tight sealing into the grooves. Eachof the jackets 33 and 34 is preferably provided with a number ofapertures covered by plates as at 41, 42 and 43, which permit access tothe cooling chamber formed by the casing portion and the jacket forpurposes of inspection or partial cleaning of such chambers. When it isdesired to clean the cooling chamber thoroughly or to obtain access tothe exterior of the casing for any other purpose, the relatively lightjackets 33 and 34 may be readily removed and replaced without disturbingthe operation of the machine. Sealing the edges of the jackets againstthe flanges 12 and 13 permits removal of the bolts (not shown)connecting the flanges 8 and 9 of the casing portions 6 and 7 withoutdisturbing the jackets, and the upper half 6 of the casing may beremoved without disturbing the arrangement of the jacket 33 thereon.

A cooling medium such as water is supplied to each of the chambers atthe lower portion thereof and is discharged therefrom at the upperportion thereof. The cooling water lls the entire spaces between theseveral portions of the casing and the jackets. Water is thus broughtinto contact with the walls defining the passage ways between theseveral wheels and abstracts heat from such walls. Due to the provisionof ribs, the amount of heat transferred from the compressor fluid in theblower or compressor is increased and the water flows through a tortuouspath from the inlet to the outlet thereof thus increasing the amount ofcooling obtained therefrom.

A cooling structure for a blower or compressor according to the presentinvention has the advantage of cheapness and ease in construction. Thejacket may be readily removed and replaced to permit complete access tothe exterior of the casing in the shortest possible time, which isparticularly advantageous when the cooling water is very impure, or themachine can be operated without cooling for only a short time. The uppercasing portion may be removed for inspection or repair of the internalportions of the machine in the shortest possible time without disturbingthe attachment oI" the cooling jacket thereto. Substantial coolingbetween the stages of the compressor is obtained without the provisionof special double walls arranged between the stages for the purpose ofpermitting the circulation of a cooling medium therethrough, thusavoiding the complicated connections of tubing to secure the desiredresults heretofore considered necessary.

Although but one embodiment of the present invention has beenillustrated and described it will be apparent to those skilled in theart that various changes and modifications may be made therein withoutdeparting from the spirit of the invention or from the scope of theappended claims.

It is claimed and desired to secure by Letters Patent:

1. A rotary blower comprising a casing divided into an upper portion anda lower portion, each portion having flanges for joining the same, saidcasing having anges extending outwardly therefrom adjacent to the firstmentioned flanges thereof, a shaft extending through said casing, aplurality of impeller wheels mounted on said shaft, a completelyremovable sheet metal jacket arranged on each portion of said casing,the edges of said jackets engaging the last mentioned flanges on saidcasing, and means for retaining the edges of said jackets in sealingcontact with the last mentioned flanges on said casing.

2. A rotary blower comprising a casing divided into an upper portion anda lower portion, each portion having flanges for joining the same, saidcasing having flanges extending outwardly therefrom adjacent the firstmentioned ilanges thereof, a shaft extending through said casing, aplurality of impeller wheels mounted on said shaft, a completelyremovable sheet metal jacket arranged on each portion of said casing,the edges of said jackets engaging the last mentioned flanges on saidcasing, means for retaining the edges of said jackets in sealing contactwith the last mentioned anges on said casing, tension members arrangedabout and retaining said jackets in Huid-tight relation with theportions of said casing, and means associated with said members toadjust the tension thereof.

3. A rotary blower comprising a casing divided into an upper portion anda lower portion, each portion having flanges for joining the same, saidcasing having iianges extending outwardly therefrom adjacent the firstmentioned flanges thereof, ribs formed to extend outwardly from theportions of said casing between the last mentioned iianges thereof, ashaft extending through said casing, a plurality of impeller wheelsmounted on said shaft, a completely removable sheet metal jacketarranged on each portion of said casing in contact with said ribs, andmeans for retaining the edges of said jackets in sealing contact withthe last mentioned flanges on said casing and in contact with said ribsextending therefrom.

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4. A rotary blower comprising a casing divided into an upper portion anda lower portion, each portion having flanges for joining the same, saidcasing having flanges extending outwardly there. from adjacent the rstmentioned flanges thereof on opposite sides thereof and spacedtherefrom, a shaft extending through said casing, a plurality ofimpeller wheels mounted on said shaft, a completely removable sheetmetal jacket arranged on each portion of said casing, the edges of saidjackets engaging the last mentioned ilanges on said casing, tensionmembers arranged about and retaining said jackets in iluid-tightrelation with the portions of said casing, and means associated withsaid members to adjust the tension thereof.

5. A rotary blower comprising a casing divided into an upper portion anda lower portion, a shaft extending through said casing and mounted forrotation therein, said casing portions having ribs formed thereon in thedirection of the axis of said shaft, and a removable sheet metal jacketarranged on each of the portions of said casing to cooperate therewithin forming a chamber for the circulation of a cooling mediumtherethrough, said jackets being retained in contact with the ribs ofsaid casing.

6. A rotary blower comprising a casing divided into an upper portion anda lower portion, a shaft extending through said casing and mounted foryrotation therein, said casing portions having ribs formed thereon inthe direction of the axis of said shaft, and a removable sheet metaljacket arranged on each of the portions of said casing to cooperatetherewith in forming a chamber for the circulation of a cooling mediumtherethrough, said jackets extending axially beyond the ends of the ribsof said casing and being retained in contact therewith to aid horizontalflow of the cooling medium in series through the channels formed in thecirculating chamber by the ribs.

WILLEM VAN RIJSWIJK.

